<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div class="box">class</div>
  <div id="bix">id</div>

  <ul>
    <li>12</li>
  </ul>
  <script>
    const obj = {
      name:'张三'
    }
    obj.name = '李四'
    

    

  </script>
</body>
</html> 